Adding machine



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G. J. BARRETT- ADDING MACHINE Filed Aug. 14l 1925 1.9 Sheets-Sheet 19 BY A ATTORNEYS Patented June 30, 1931v UNITED STATES PATENT OFFICE GLENN J'. BARRETT, 0F EVANSTON, ILLINOIS, ASSIGNOB TO YOBTABLE ADDING HA-` i CHINE COMPANYOF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS ADDING MACHINE Application med August 14, 1925; serial n.9; 50,219.

' This invention relates more particularly 'to various improvements inthe details of construction of -a key-setL addingmachine, which enables meto build a portable machine adapted to perform all the essential functions of the larger types of commercial add'in and listing machines and to carry out su stantially all the special feature op-v crations controlled by, special keys. The various mechanisms in my present improvement are much simplified 'in construction as com ared with prior machines now on the maintain simplicity of construction with absolute reliability in operation, and, at the same time, eliminate, as far as possible, complicated mechanical movements and thereby reduce the number of parts, which, it will be understood, makes for low cost production. One object, therefore, has been to improve the key-board unit andv particularly to con.- dense the key-board by using smaller key caps, which enables me to closer together without inter er'ng with t e ease of operation of the key-board. Furthermore, the entire key-board unit is prefera-bly so constructed and assembled that it may be readily removed ,from the machine frame and my key-board unit includes many vassociated parts which ordinarily vare mounted in the main frame of the machine and, therefore, not removable with the key-board.

' Structurally, the object has been to arrange all of the associated elements carried by the keyboard unit, so that'no positive connections are required between the various mech'- anisms of the keyboard unit and the mechanisms with which they cooperate in the body of the machine, such cooperating parts be- 'ing subject to contact engagement only.

A further object has been toimprove land vrsiinplifythe key control olf-the 'adding4 units place the ke sl and to so arrange the key Vcontrolled stop slides, which are spaced apart th'edistance b etween and for cooperation with the respective rows of keys, that they are connected by means of intermediate links with the corresponding adding sectors and the latter are arranged in more condensed form, so that the spacing therebetween will corres ond with the spacing of the printed num rs. In this connection, an important improvement has been incorporated which comprises a resilient connection between the respective links and stop slides, which will permit restoration of the adding sectors, without injury to the machine, in case of accidental depression of a key prior to the complete restoration of the stop slides to normal position. A y

A further vobject has been to improve the recording or listing mechanism by the. direct association of type segments with the respectve adding sectors and utilizing the type segments as driving elements connected by pin and slot connections with the adding sectors to permit relative movement therebetween to the extent of one unit for transfer of the tens. The adding sectors and type segments are connected together by means ofpsprings for effecting relative movement therebetween in the transfer of the tens.

spectve adding sectors are, therefore, mounted in condensed form, corresponding to the spacing between the printed numbers, and each segment is provided with fixed type representing the numerals to be printed. The type are faced radially outWard.--and mounted concentrically of the Imain shaft, about which the type segments and associated adding sectors are'adapted-to rotate. further object is to provide an` improved pressure printing platen adapted to be vmoved into cooperative printing. relation with the type segments for printing the successive numbers to be added and the associated mechanisms include various novel features', particularly in connection with the line spacing and ribbon feed mechanism, which are adapted to be operated as incidentto The type segments associated withv the re- 

